quadrupedism

Etymology tree
Proto-Indo-European *kʷetwóresder.
Proto-Indo-European *kʷetwr̥-
Proto-Italic *kʷetru-
Proto-Indo-European *ped-
Proto-Indo-European *-s
Proto-Indo-European *pṓds
Proto-Italic *pets
Proto-Italic *kʷetrupōts
Latin quadrupedembor.
French quadrupèdebor.
English quadruped
Proto-Indo-European *-id-
Proto-Indo-European *-yéti
Proto-Indo-European *-idyéti
Proto-Hellenic *-íďďō
Ancient Greek -ῐ́ζω (-ĭ́zō)
Proto-Indo-European *-mos
Proto-Indo-European *-mós
Ancient Greek -μός (-mós)
Ancient Greek -ισμός (-ismós)der.
English -ism
English quadrupedism
From quadruped + -ism.